Tableau Data Functions

In this Tableau tutorial, we learned about various Data functions in Tableau, different Tableau Data functions< with examples.

In Tableau provides various Date Functions are available followings are: Year, Month, Day, makedate, maketime, datediff, datepart, dateadd, datename, datetrunc, now, today, etc.

We will be able to create more effective dashboards if you have a deeper understanding of Tableau dates, date functions, and how to use them. Tableau has a lot of date functions. Some alter dates, while others convert data to dates and still others determine whether data is a date.


Date function is defined that allow us to interact with date entries in a data source to which we have accessibility. We may use these Date Functions to perform modifications to existing dates, search for certain dates, and generate new. Date Functions, on the other hand, allow us to change date data and adapt it to the requirements of our assessment. Tableau Data Analysts rely heavily on data functions.

Use of Data function in Tableau

  • Tableau’s Data Function allows us to perform logical and arithmetic calculations on date data to accomplish our analysis needs.
  • In Data Function Date fields are critical in almost any set of data and analytics since we cannot possess time referencing in the data without date values such as a year, month, week, quarter, and so on.
  • We can build date fields and conduct complex procedures on them with the assistance of Tableau’s date functions.

How Does Tableau Interpret Date Fields?

Tableau uses its internal process to determine the actual element as a date field even when a additional data sources is added.

The necessary procedures can be summarized:-

  1. Date Fields Verification

    To differentiate and recognize if the records include the date, confirmations are needed. It can be done by determining whether the date strings is available in the connecting sources or displayed in the dimensional level. This phase aids in the separation of non-date and date records.

  2. Modify the field’s data type.

    Whenever the data needs to be updated, such as if the entry contains a large amount of null values, the next phase in this method is used. In natural, these fields are converted to string types and supplied to the Dateparse function.

  3. Parse the date format.

    In the data records, there seem to be endless array formats. The Dateparse method is being used to describe the sections of the date. Tableau will be using this mapping to convert the string data to date format. Formatting for tableau is the name of this map.

  4. Defining the Statement for the Date Function

    If the information is not from the string type and is in a different format, such as numeric, the DATE function is being used to transform the representation to a date format. In the data source, Tableau adds a new date field.

Types of Date Function

DATEADD Function

The DATEADD function includes increasing a date by specifying a component of that as well. By changing the date part, the value we are using for period would change the data_part.


DATEADD(date_part, interval, date)


This function returns the difference among dates 1 and 2, written in date part-determined units. The start of week variable is optional; if this is not given, the related data source determines the starting of every week.


DATEDIFF (date_part, date1, date2, start_of_week)


The date_part argument of the dates can be returned as a string using this function. The start_ of_week variable is, once again, configurable.


DATENAME(date_part, date, [start_of_week])


This function is performed in the other direction of DATENAME, transforming a string into such a date/time in the pattern we choose. This will return the value of Zero if a string doesn’t always match the date/time standard.

Just Microsoft Excel, MySQL, Oracle, PostgreSQL, Tableau data extraction, and file format sources of information support the function.


DATEPARSE(format, string)


The DATEPART function returns a numeric representation of a specified date part. The start of week variable is, once again, configurable.

Because Tableau applies variances in a predefined sequence, the start of date option is ignored whenever the date part is set to weekdays.


DATEPART(date_part, date, start_of_week)


The date is truncated to the reliability of the date part which we give in the function with this function. To put it another way, it rounds up to that date part.

If start of week is not specified, the data source determines it.


DATETRUNC(date_part, date, start_of_week)


As an absolute value, this method contains the day of supplied date.




This is a conceptual test which is also part of the Logical Functions listing. It determines whether a string is a genuine date (true/false).



MAX Function

The MAX function can be found in a variety of functions, which include Date Functions. The MAX function will return the highest value of a single statement over all entries, or the highest value of two variables for every record. The types of the two possibilities should be the same. If either parameter is NULL, this method will return NULL.


MAX(expression) or MAX(expr1,expr2)

MIN Function

The MIN function, such as the MAX function before it, is most usually employed as a Number Function, although it could also be used for dates. The MIN function will return the minimum of two statements for every record or the minimum of the aspecific instance throughout all records. If any of the two inputs is NULL, MIN returns NULL. The two options must have the same type of argument.


MIN(expression) or MIN(expr1,expr2)


This method, like the DAY function for the day, provides the months of the supplied date as a numeric.




The current date and time are returned.




The current date is returned.




The YEAR function returns a number representing the year of the supplied date.




Q. What is the purpose of a date function?

The DATE function in Excel creates a date by combining three different values (year, month, and day). This can be used to accomplish a wide range of operations associated to dates, such as generating specific dates, if combined with other Excel functions.

Q. What is the difference between date parts and date values?

For continuous dates, date variables are required. They have the same date components structure (i.e. year, quarter, month, week, day and so on). Date values are different from date parts in that they represent a level of information in a timeline. Continuing fields, on the other hand, need not create headings; instead, they establish an axis.

Q. How do you display dates in Tableau?

The worldwide standard suggests displaying the date as YYYY-MM-DD (year, month, day). As a result, while both Australians and Americans was using this, the date would be 2012-04-21. By putting the year first, this writing style the date prevents any mistake. While displaying the date in Asia, this is the most common format.

Q. How do you display dates in Tableau?

Right-click a date area in the Data panel and select Default Settings > Date Format from the context menu. When the application is joined to a Tableau data extraction or has a live connection to a data research that proves the date format, the date styles in the tables are enabled.

Q. How do you abbreviate months?

Months are abbreviated in this way.

“Month” is abbreviated as “mo,” and “months” is abbreviated as “mos.” While abbreviating either of the other words isn’t required, this can be useful when trying to reduce place on the work. If we include terms on the resume, though, it must be reliable.

Q. How do we calculate Month-over-Month change?

Reduce the very first month from the second month, and divided by the previous month’s sum to get Month-over-Month increase. We will get 100 % if we multiply the output by 100.

The month-over-month rate of growth is expressed as a percentage.

Q. What do you use bins for?

Credit cards, charge cards, prepaid cards, debit cards, and gift cards all have BINs. The BIN is a number that retailers use to observe and analyze their credit card payments. The number enables merchants that accept a variety of payment methods and payment processes more quickly.


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